MSNBC's Technology and Science site has put together a list of some of the strangest things in space.
QuasarsThese bright beacons shine to us from the edges of the visible universe and are reminders to scientists of our universe's chaotic infancy. Quasars release more energy than hundreds of galaxies combined. The general consensus is that they are monstrous
black holes in the hearts of distant galaxies. This image is of quasar
3C 273, photographed in 1979.
Vacuum EnergyQuantum physics tells us that contrary to appearances, empty space is a bubbling brew of "virtual"
subatomic particles that are constantly being created and destroyed. The fleeting particles endow every cubic centimeter of space with a certain energy that, according to
general relativity, produces an anti-gravitational force that pushes space apart. Nobody knows what's really causing the accelerated expansion of the universe, however.
Anti-matterLike Superman's alter-ego,
Bizzaro, the particles making up normal matter also have opposite versions of themselves. An
electron has a negative charge, for example, but its anti-matter equivalent, the
positron, is positive. Matter and anti-matter annihilate each other when they collide and their mass is converted into pure energy by Einstein's equation
E=mc2. Some futuristic spacecraft designs incorporate anti-matter engines.
Mini Black HolesIf a radical new "
braneworld" theory of gravity is correct, then scattered throughout our solar system are thousands of tiny black holes, each about the size of an atomic nucleus. Unlike their larger brethren, these mini-black holes are primordial leftovers from the
Big Bang and affect space-time differently because of their close association with a
fifth dimension.
Cosmic Microwave BackgroundAlso known as the CMB, this radiation is a primordial leftover from the
Big Bang that birthed the universe. It was first detected during the 1960s as a radio noise that seemed to emanate from everywhere in space. The CMB is regarded as one of the best pieces of evidence for the theoretical Big Bang. Recent precise measurements by the
WMAP project place the CMB temperature at -455 degrees Fahrenheit (-270 Celsius).
Dark MatterScientists think it makes up the bulk of matter in the universe, but it can neither be seen nor detected directly using current technologies. Candidates range from light-weight
neutrinos to invisible
black holes. Some scientists question whether dark matter is even real, and suggest that the mysteries it was conjured to solve could be explained by a better understanding of gravity.
ExoplanetsUntil about the early 1990s, the only known
planets in the universe were the familiar ones in our solar system. Astronomers have since identified more than 319 extrasolar planets (as of October 2008). They range from gargantuan
gas worlds whose masses are just shy of being stars to small, rocky ones orbiting dim,
red dwarfs. Searches for a second Earth, however, have so far turned up empty. Astronomers generally believe that better technology is likely to eventually reveal several worlds similar to our own.
Gravity WavesGravity waves are distortions in the fabric of space-time predicted by Albert Einstein's
theory of general relativity. The waves travel at the
speed of light, but they are so weak that scientists expect to detect only those created during colossal cosmic events, such as
black hole mergers like the one shown.
LIGO and
LISA are two detectors designed to spot the elusive waves.
Galactic CannibalismLike life on Earth, galaxies can "eat" each other and evolve over time.
The Milky Way's neighbor,
Andromeda, is currently dining on one of its satellites. More than a dozen star clusters are scattered throughout Andromeda, the cosmic remains of past meals. The image is from a simulation of Andromeda and our galaxy colliding, an event that will take place in about 3 billion years.
NeutrinosNeutrinos are electrically neutral, virtually mass-less
elementary particles that can pass through miles of lead unhindered. Some are passing through your body as you read this. These "phantom" particles are produced in the inner fires of burning, healthy stars as well as in the
supernova explosions of dying stars. Detectors are being embedded underground, beneath the sea, or into a large chunk of ice as part of
IceCube, a neutrino-detecting project.
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That's all!
--->Susan
